期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 4, 期 7, 页码 3743-3749出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b00383
关键词
Water electrolysis; Hydrogen evolution reaction; Cobalt monoxide; Molybdenum oxide; Composite
资金
- College of Arts and Sciences, University of Missouri-Kansas City
- University of Missouri Research Board
- University of Missouri-Kansas City, School of Graduate Studies
- National Natural Science Foundation of China [51302072]
- China Scholarship Council
Special structures of materials often bring in unprecedented catalytic activities, which are critical in realizing large-scale hydrogen production by electrochemical water splitting. Herein, we report a CoO/MoOx crystalline/amorphous structure as an effective bifunctional electrocatalyst for water splitting. Converted from CoMoO4 by hydrogenation, the CoO/MoOx, featured with crystalline CoO in amorphous MoOx matrix, displays superior catalytic activities toward both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). It shows small onset overpotentials of 40 and 230 mV for the HER and OER in 1.0 M KOH, respectively, and overall water splitting starting at 1.53 V with a robust stability. The high catalytic activity of the CoO/MoOx is benefited from the large defect-rich interface between CoO and MoOx, along with the amorphous nature of MoOx. Thus, this study demonstrates the effectiveness of structural manipulation in developing highly active electrocatalysts for overall electrochemical water splitting.
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